SC2446 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC2446' PDF : 38 Pages View PDF
SC2446
POWER MANAGEMENT
Pin Descriptions
Pin
Pin Name Pin Function
21
GDL2
Gate Drive Output for the Low-side N-channel MOSFET of Output 2. Gate drive voltage
swings from ground to PVCC.
22
PGND
Ground Supply for All the Gate drivers.
23
PVCC
Power Supply Voltage for Low-side MOSFET Drivers.
24
GDL1
Gate Drive Output for the Low-side N-channel MOSFET of Output 1. Gate drive voltage
swings from ground to PVCC.
25
GDH1
Gate Drive Output for the High-side N-channel MOSFET of Output 1. Gate drive voltage
swings from ground to VBST1.
26
BST1
Bootstrapped Supply for the High-side Gate Drive 1. Connect to a bootstrap capacitor and an
external diode as described in application information.
The First Step-down Converter Virtual Phase Node (Unloaded). Used for "Combi" current
27
VPN1
sense only. This pin is left open when sensing current with a sense resistor at the converter
output.
An external capacitor tied to this pin sets (i) the soft-start time (ii) output overload latch off
28
SS1/EN1 time for buck converter 1. Pulling this pin below 0.7V shuts off the gate drivers for the first
controller.
2004 Semtech Corp.
7
www.semtech.com
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